My passenger tires is wearing out on inside...it makes a humming sound
Get your front end aligned. Or at least checked. It's not going to get better.
Mark is right but, have you rotated your tires? It could be a bad lower control arm bushing/ball joint. Have the car looked at by a reputable mechanic.
Deb, you wrote 'tires' do you mean both front and rear?
Looking for a Used Santa Fe in your area?
CarGurus has 35,580 nationwide Santa Fe listings starting at $800.
Search Hyundai Santa Fe Questions
Hyundai Santa Fe Experts